Cutter-head.



15 SCHWARTZ.

CUTTER HEAD.

APPLICATION FILED MAR.29. |917. ]L,2J9,839m Patented ma. 111,191?.

. lll 12 l f/i i 1o i 1S 5 4 llll llll

alli:

till

i purr JEPH SCHWARTZ, F DETROIT, MICIIGAN.

` cortesemente.

Specification of Letters Patent. Patented :Dem 11, 191m Application tiled March 29, 1917. Serial No. 158,144.

prising flat pieces ot steel and .an object ot" the invention is to `provide means tor securely holding these blades in place 1n such a manner that breakage is minimized and the blade may be quickly adjusted or re-` nioved.

.il further object is to facilitate rnanutaoM ture and cheapen the construction which is such as to adapt the same to the various terms ot cutting or i'orining tools.

A tui-ther object ol' this invention is to provide an in'iproved construction ofcut ter head and arrangement ot cutter blades, whereby a coi'itinuous irregular surt'ace `niay be formed and a cheap and ellicient tool secured.

llvith these and otherends in view, the invention consists in the matters hereinafter niore fully described and particularly pointed out in theappended claims, reference being had to the accompanying drawings in n'hichllfigure l is an end elevation of a cutter head illustrative ot the invention and show ing parts oniitted and others broken away to more clearly illustrate the construction;

lllig. El is a central longitudinal section through the same, and i lfig. 3 is a detail showing a slightly modiu lied oonstructiom i lllor convenience otillustration, the inn vention is shown as embodied in a rotary termino; tool tor boring inside irregular sur laces, but it will be understood that certain tentures ot the invention may be applied to other terms ot cutters and the construction and arrangement of parts may be changed, `Within the scope ot the appended claims, to suit the particular Work to be done.

tls shown in Figs. l and 2, a suitable head l is provided having an internally screw-threaded bore 2 at one end 'for the attachment ot the device to a spindle or other rotary' driving member ot a `machine and this head is also formed with a circumference tial flange 3 having a series of slots cut therein to receive rectangular cutter blades or plates 4t having end cutting edges 5 to en gage the Work. These cutters Ll are backed up by a ring 6 upon a screw-threaded rear end portion of the head and engaged by a locking ring 7 so that by turning the ring 6 the cutters may all be moved longitudinally toward the work as they Wear away in use.

To securely hold these cutters 4 against movement in their slots, Wedge blocks or pins 8 are provided, one for each cutter to engage the forward side thereot' in the direcn tion ot' rotation. Each wedge pin is seated Within a hole 9 which is bored inwardly of the flange 3 adjacent the slot tor the cutter. These holes are bored before the slots are milled out and each slot is cut radially inward of the head with one side of each slot cutting into the bore or hole 9, which hole, when it is formed, is bored inwardly at a slight angle to a radial line of the head so that the axis of each hole is at a slight angle to the adjacent face of the slot with said face and bore diverging inwardly. Each Wedge pin 8 is first formed cylindrical with a reduced and screw-threaded shank l0 at its outer end and then the side of the pin which is adapted to engage the face of the cutter, is milled oli" at an angle or incline corresponding to the angle at which the cut ter sets in the head, that is, the contact face 11 of. each Wedge pin diverges from the axis liti gli

ot' the pin toward the inner end ot the plus,

and thus when the pin and cutter are in place, the pin will exert a Wedging or bindlng action on the side of the cutter when the pin is pulled outwardly in its bore by means of a nut 12 on the outer end` of its shank engaging a clamp 13 interposed between the outer edge of the cutter and the nut, said clamp being formed with a hole through which the shank loosely passes. Each clamp has a tail piece 14 extending rearwardly and inbent to engage a notch 15 in the edge of the iange 3.

The cutters are thus lirrnly wedged laterally into their seats in the grooves and held against edgewise displacement. The clamps by being free on the shoulder of the pins and seated at one end on the chuck body or liange 3, have a leverage to strongly `torce the cutters edgewise `and the tapering or Wedge shaped pins exert a heavy pressure to firmly seat the cutters against the plane Sulf be heldy against movement longitudinally of the head by forming each cutter with a transverse groove and also'providing a corresponding groove in the plane seating surface. of tlie vslot in the head for the cutter. In thesegrooves is a pin 16 which, while preventing theA critter from moving in the I i direction of the length of its wedge pin S perm-its of ready adjustment of the cutter outwardly or radially it wears away inus'e.l 'Y Y "The cu-tterhead or body 1 may be pro-' n vided with an endextension 17 beyond the flange' 3 and this extension may have longis t-udinajl radially extending slots for other cutter-'plates 1S held in place thereon by wedge pins and clamps identical with those which are provided to hold the cutters 4, said cuttersflSfhaving formed side. edges 19 to give the desired form to the bore in the work.' ln this instance the bores for the Wedge pins extend inward from the end of the liea'd at an angle to the plane of the grooves for the cutters and the clamps held bythe nuts on the Shanks of said pins are applied to the ends of the' cutters to prevent movement in a direction longitudinally of thel head. These cutters 18 are set in staggered relation to the cutters 4 and thus the" side surface formed byv said cutters 1S forms acontinuation of the end surface formed by the cutters 4. 'These cutters 1S are 'adjusted radially as these outer cutting edges wear away in use, by means of wedges 2li'T engaging in the bott-oms of the slots for said Qnttersand these wedges are forced inwardly by' means of a nutor ring 21 on an externally screw-threaded tubular extension 22 ofthe head. A lock nut 23 is provided for the nut 2 0.

A verysimple and compact cutter head is thus secured for the purpose, which is cheap ton manufacture and eflicie-nt in operation.

Having thus described my invention what I claim is :.-f

" 1. In a device ofthe character described, the combination of a body having a bore. extending into the body and a slot cutting into one side of the bore, the axis of said bore and the plane ofv said slot diverg-ing towardtheir inner closed ends, a cutter plate in the slot, a wedge member in the bore havingy a side to engage the cutter plate, and means for moving the wedge member outward-ly in its bore relativ-ete said plate,

wherebydsaid member is forced laterallyagainst said plate,

2. In 'a device of the character described, the combination of a` body formed with a, hole extending into the body and a slot cutting into one side of the hole, the longitudinal plane of the hole and slot diverg ing toward the inner closed ends of the hole and slot, a cutter in the slot, and a tapered wedge member in the hole with its largest end toward the inner closed end of the hole, said member being adapted to engage said cutter when moved outward in the hole.

8. In a device of the character described, the combination 0f a body formed with an inwardly extending hole and a slot cutting inthe hole, the hole and slot extending inward in divergent directions, a cutter plate in the slot, a wedge member in the hole` having a side conforming to thc adjacent side of the plate to engage the same, and means on the outer end of said wedge member to engage thel edge of the plate projecting from the outer end of the Slot.

l. I n a device of the character described, the. combination of a body formed with an inwardly extending and diverging hole and slot with the slot cutting into the side of the hole, a cutter plate in the slot and projecting therefrom, a wedge member in the hole having a tapering side to engage the side of the plate and provided with a scre\.y-tlir .adcd end projectingv from the hole, and a nut on said screw-threaded end to engage the outer end ofthe plate.

5. ln a device of the character described,

the combination of a circular head having radial slots therein and holes extending in wardl-y in divergent relation to said slots withv a hole cutting into one side of cach slot, a cut-terplate in each slot projecting therefrom, a wedge4 member which is larger at its inner than at its outer end in cach hole and having a projecting outer end, and a member on the outer end of each wedge member for moving saidv members outwardly in the holes. Y 6. ln ay device of the character described, the combination of a circular head having radial slots therein and holes extending inwardly in divergent relation to said slots with a hole cutting into one side of cach slot, a cutter plate in each slot projecting therefrom, an outwardly tapered wedge member in each hole and having a reduced and screw-threaded outer end. a nut on said screw-threaded outer end, and members` iutei-posed between said nuts and the outer edges of said plates with an end of each member engagingv the head, said head heilig formed with notches to` receive said ends.

7; In al device. of the character described, the combination of a cylindrical head having a flange provided with radial slots and an end portion formed with a dial slots extending inward from said end and through the side thereof, the slots in the flange being in staggered relation to the slots in the end por tion, and saicl head being provided with a loore cutting into one side of each slot with the axis of each loore in inwardly divergent relation to the plane of the adjacent slot, cutter plates in all of the said slots, Wedge pins in said bores having flattened sides to lo engage the plates, means on the outer ends JOSEPH SCHWARTZ.

Witnesses:

ANNA M. Donn, G. E. MCGRANN.

tloplea of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

